The big trade rumor came to fruition when the Arizona Diamondbacks, Cincinnati Reds and Cleveland Indians agreed to a three-way deal Tuesday night. The most established major leaguer, Shin-Soo Choo, heads from Cleveland to Cincinnati.

But arguably the biggest (and most surprising) name in the deal is righthander Trevor Bauer, drafted third overall by the Diamondbacks in 2011 and now part of a fantastic haul by the Indians.

Shin-Soo Choo is heading to the Cincinnati Reds. (AP Photo)

The Diamondbacks receive shortstop prospect Didi Gregorius from the Reds, and lefthanded reliever Tony Sipp and first baseman Lars Anderson from the Indians. Cleveland also receives righthanded relievers Matt Albers and Bryan Shaw from the Diamondbacks and center fielder Drew Stubbs from the Reds. The Reds also get utility infielder Jason Donald and cash from the Indians.

Choo will fill two needs for Cincinnati: leadoff hitter and center fielder—although he has played just 10 games in center during his eight-year major league career. The small outfield at Great American Ball Park should help his transition, but his offense is clearly his greatest asset. Choo, 30, has been among baseball’s most underrated producers. In 2012, he hit .283/.373/.441 with 16 homers, 67 RBIs and 21 stolen bases.

For the Reds, this is a straight win-now move, as Choo is signed only through next season. He has a career .289/.381/.465 line with a 132 OPS-plus. Choo also hits from the left side, something Cincinnati needed to balance its lineup.

But it is Bauer who could become the steal of this trade. The 21-year-old was named the Diamondbacks’ minor league pitcher of the year after going 12-2 with a 2.42 ERA in 22 starts between Class AA and AAA this past season. Before the 2012 season, Baseball America ranked Bauer as baseball’s No. 9 prospect.

But while scouts still consider Bauer a future ace, the Diamondbacks obviously had devalued him because of what they perceived as an inability to make adjustments as instructed.

Most importantly for Arizona, this trade netted a shortstop. And the addition of Gregorius could cement right fielder Justin Upton’s future with the organization. Upton had been shopped as the Diamondbacks hunted for infield help, but they filled that void without sacrificing Upton.

Still, this is somewhat of a head-scratcher for Arizona. It lost its top pitching prospect and received Sipp (no longer a prospect at 29), Anderson (blocked at first base by Paul Goldschmidt) and Gregorius.

Still just 22 with only 21 major league plate appearances, Gregorius projects as anything from an everyday big league shortstop to a utilityman. He was named to the Arizona Fall League’s Top Prospect Team, flashes a solid glove and has a strong arm. And he probably will start at short on opening day.